怎么知道万有引力提供重力,还是�心力?而且为什么�心力等于重力的时候在太空中完全失重? 知乎 Template




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tomski怎么知道万有引力提供重力,还是�心力?而且为什么�心力等于重力的时候在太空中完全失重? 知乎 coloring